Had to read that twice before I could see the hidden twilight had to have passed rather than the shown cognac be hiding under the babys twilight.
As we see from Lapis Pedigree he must hide twilight as Odyssey Skyline is known to be recessive to it.
As you pointed out OCM is known dominant to Twilight so if the Mum hid that it would have shown NOT Twilight, there fore Mum has her Mums Cognac showing and her dads hidden Twilight hiding so Twilight is recessive to Cognac or Cognac is Dominant to Twilight, Whichever way you want to say and should confuse Kayla just enough
That just leaves Odyssey Cognac Moon to test for placement
Great work.